Rocky Mountain Voo Doo External Elk Call - The Voo Doo cow call was designed to put a spell on the majestic bull elk. With its unique sound board of vented holes and tone quality acrylic barrel, this call will produce realism, accuracy and ease of use in elk call sounds. Easy to obtain mews and chirps of both cows and calvesVented holes and tone quality acrylic barrelPleading estrus sounds